The Federal Segment Architecture Methodology (FSAM) is a step-by-step process for developing and using segment architectures that was developed by distilling proven best practices from across Federal agencies. Use of the FSAM should result in more complete and consistent segment architecture products and will result in greater reuse of segment architectures by providing key information that informs downstream processes for capital planning, security (e.g. certification and accreditation), and the system development life cycle.